fix : ensure encryption key is always bytes in PrivacyManager

[tmdeveloper007]

Summary of What Has Been Done

Fixed the encryption key initialization in src/utils/privacy.py to ensure the key is always bytes before passing to Fernet().

The previous code used os.getenv("ENCRYPTION_KEY", Fernet.generate_key()). Since os.getenv() always returns a string (or None), if ENCRYPTION_KEY is set as an environment variable, Fernet(string_key) would crash with a TypeError. Fernet.generate_key() returns bytes, but only when the env var is NOT set.

Changes Made

• src/utils/privacy.py: Changed key initialization to explicitly handle string env vars by encoding them to bytes:

raw_key = os.getenv("ENCRYPTION_KEY")
if raw_key is None:
    self.encryption_key = Fernet.generate_key()
elif isinstance(raw_key, str):
    self.encryption_key = raw_key.encode()
else:
    self.encryption_key = raw_key

Impact it Made

• Prevents crash when ENCRYPTION_KEY environment variable is set as a string
• Ensures consistent bytes-based key for Fernet regardless of how the key is provided
• Maintains backward compatibility with existing code

Note

Please assign this PR to the tmdeveloper007 account.

Closes #1326

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